Kawiwan's apartment was perfectly comfy for my two night stay in Bangkok. While relatively convenient, it's still a hot walk to the BTS during the day, so I would recommend using an umbrella to keep the sun off. The guards at the basement is very helpful and will lock up your bag for you if you want to drop your things early before check in or keep them at the condo after you check out on the last day. Taxis come down the soi pretty regularly, but Uber or GrabTaxi is also a good option (GrabTaxi recommended if you're going to the airport).